Smoke detector



FIG. 1 is a front elevational view of the smoke detector showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view as seen from the right of FIG. 1; and

FIG. 6 is a side elevational view as seen from the left of FIG. 1. 

The ornamental design for a smoke detector, as shown. 